我有一个大数据（.tr 文件）。我已阅读该文件并重命名数据框 (df) 中的列。我设法检查了所有现有记录并检查了某些条件。我需要计算整个文件中存在多少唯一值（来自 src.port 列）？以下 MWE 将说明我的问题。
# The df looks like:
st time from to protocol size flags flowID src.port dst.port seq pktID
+ 0.100000 1 2 tcp 40 ------- 1 5.0 2.1 0 0
- 0.100000 5 0 ack 40 ------- 1 5.1 2.3 0 0
r 0.102032 1 2 tcp 40 ------- 1 5.20 2.5 0 0
r 0.102032 1 2 tcp 40 ------- 1 5.11 2.6 0 0
r 0.102032 1 2 tcp 40 ------- 1 3.0 2.0 0 0
+ 0.121247 11 0 ack 40 ------- 1 11.1 2.10 0 1
r 0.132032 1 2 tcp 40 ------- 1 3.0 2.0 0 0
r 0.142065 1 2 tcp 40 ------- 1 3.0 4.0 0 0
# I have tried the following:
unique<-0
for (i in 1:nrow(df)){
# feel free to suggest different way from the below line.
# I think using the name of column would be better
if(df[i,1]=="r" && df[i,3]== 1 && df[i,4]== 2 && df[i,5]== "tcp" ){
# now this condition is my question
# check if df[i,9] is new not presented before...Note 5.0 is different from 5.1
# check if df[i,10] is 2 and ignore any value after the dot (i.e 2.x ..X means any value)
# so the condition would be:
if ( df[i,9] is new not repeated && df[i,10] is 2.x)
unique<-unique+1
}
}
从样本数据的预期输出：是唯一的= 3